What Causes Episodes Of Head Spinning In A Fit Middle Aged Man?

Hey! I am 50 years old fit guy father of four but for the few months i have been realizing spinning of my head many times a day and then it will go and then it will come after few days…i take vitamins tablets for my health I don’t have any serious health problems apart from my heart but I don’t think they are connected and my MRI report was clear too no sign of anything.